feat: support drop partition table parallelly

[chunshao90]

Rationale

Support concurrent deletion of partition subtables at the shard level.

Detailed Changes

• Dispatch drop partition sub table concurrently.

Test Plan

Manual test and CI.

CREATE TABLE `demo1`(
    `name`string TAG,
    `id` int TAG,
    `value` double NOT NULL,
    `t` timestamp NOT NULL,
    TIMESTAMP KEY(t)
    ) PARTITION BY KEY(name) PARTITIONS 400 ENGINE = Analytic

It takes 4 seconds to drop this partition table demo1 which contains 400 sub-tables.